EP0048735A1 - Reduction of cutoff length for folding mechanisms - Google Patents

Abstract

In the field of paper cutting and folding, the invention relates to the problem of reducing the length of the scrap for a paper folding and cutting unit having a folding cylinder (10) and a cutting cylinder (30). supported on side frames (12-14). The method includes reducing the outer diameter of the folding cylinder (10) and the cutting cylinder (30) and reducing the distance between the two cylinders. In one embodiment, the reduced size cutting cylinder (30) is supported on eccentric sleeves (42) arranged in widened bores formed on the side frames (12-14). In another embodiment, the cutting cylinder is supported on an auxiliary frame (110) which can also support an additional drive shaft (12).

Description

DESCRIPTION

Reduction of Cutoff length for folding Mechanisms

Technical Field

This invention relates to reduction of the paper cutoff length and conversion of existing paper folding units and particularly to conversion of a 3/2 folding and cutting unit to reduce the paper cutoff length.

Due to economic conditions, today's cost of operating a printing facility or newspaper continues to increase. One of the principle increases in the cost of production is the cost of paper and ink. Many of the newspapers today use 23 9/16 to 22 3/4 inches for a cutoff length and wish to convert to .between 56 centimeters and 21 1/2 inches. The resulting reduction in cutoff length results in 3 to 9% savings of paper without appreciable reduction in printing space. This would result in a tremendous savings in production cost and energy.

Many of today's newspapers are converting to a European paper length of 56 centimeters from a length of 22.75 inches. Since the folder is generally connected to a web type printing press, it is a complex matter to simply reduce the size and maintain the same surface speed of the paper moving through the folder as well as the strength of the cylinders of the folder. Most folders in the newspaper industry are of a dual type having a first fold unit positioned above, then a cutting mechanism and a second fold unit to make the final crease below. Several webs of paper are usually combined such that an entire paper or section of paper is cut and folded in one operation.

Several million dollars of investment are tied up in machinery geared to fold and cut the longer lengths of paper, such as 22.75 inches. A switch over to a shorter length of paper, such as 56 centimeters, requires either a conversion of the existing unit or abandonment of the equipment.

The method described in this application covers many different size reductions. For example, 22 3/4 inches to 56 centimeters often used in the Imperial 3/2 inches description is incorporated herein for all purposes. However, this folder does cut and fold many other sizes.

Disclosure of Invention

This invention is directed to conversion of the unit which allows maximum use of existing portions of the cutting and folding mechanism and retaining their strength. The cutting and folding mechanism briefly comprises an upper folding unit where the web is folded in half and driven toward a folding cylinder and a cutting cylinder secured between two side frames. The folding cylinder has a spider mechanism adapted to guide a pair of tucking blades between two second fold rollers. A separate cutting cylinder has a pair of serrated blades adapted to cut the web at a specified length. The problem is to reduce the diameter of the folding cylinder and cutting cylinder without disturbing the gearing of the tucking blades which encompasses the complicated portion of the machine and yet reduced the cutoff length of the paper.

One method briefly comprises positioning a fixture in the side frame after the removal of all the rollers from the device to enlarge the bore of the hole in the side frame supporting one end of the cutter roller adjacent the drive side. A pair of the sleeves having eccentric or off-center holes are then positioned in the enlarged bore and the existing bore in the other side frame to reduce the center distance between the folding cylinder and the cutting cylinder. The cutting cylindder is reduced in the diameter and the depth of pocket for the blades is increased to compensate for the reduction in diameter.

The folding cylinder is modified by removing the retaining pin assemblies, of which there are three, and milling the surfaces of the retaining pin aasemblles support casting inwardly approximately 11/16 of an inch without reducing the strength of the folding cylinder. The retaining pin assembly is replaced without being modified.

The foldling cylinder has s series of adjustable bands positioned thereon which must be reduced. An adjusting mechanism retins one end of the bands. The bands are removed at both ends such that the ruface area supporting the adjusting mechanism and the fixed end can be reduced such that the bands may be repositioned. A portion of the adjusting mechanism is modified to permit use cf the adjusting mechanism. These bands adjust for different thicknesses of papers from a single web to a 160 page newspaper.

Thus, the tucking blade still centers between the two second fold rollers just belcw the folding cylinder. This is mandatory since there is only a small fraction of an inch clearance as the tucking blade swings around and tucks the web bewteen the two rollers. The second fold rollers are reduced in diameter and remounted in the same adjustable levers.

The web is moving through the press at a surface speed equivalent to the surface speed of the smaller diameter printing cylinders. Some of the gears driving rollers in the upper folder and lower folder are changed to match their surface speeds with the surface speed of the printing cylinders in the press.

A second method of reducing the center distance between the folding cylinder and cutting cylinder includes inserting an auxiliary side frame adjacent the interior of the side frame on the drive side of the folder. A power-take-off shaft is positioned through the auxiliary and old side frame. The end of the cutting cylinder is cutoff and positioned in a new bearing in the auxiliary side frame. A gear is positioned on the shortened end of the cutting cylinder and driven by the power-take-off shaft to drive the cutting cylinder. A stub shaft is mounted in the old cutting cylinder support hole to support the old driven gear to drive the folding cylinder. This method reduces the need for on-site milling and boring modifications which are more difficult to control the accuracy of. A primary object of the invention is to convert existing cutting and folding mechanisms such that they will be able to cut at the shorter length of paper by utilizing existing parts and assemblies.

A further object of the invention is to minimize conversion cost, thus maximizing the use of existing folding unit and equipment thus minimizing waste and energy loss of this equipment.

A still futher object of the invention is to reduce the cutoff length of the paper thus reducing the production cost in printing facilities by converting existing equipment.

A still further object of the invention is to reduce the diameter of the folding cylinder without reducing the strength of the cylinder and enable existing moving parts to be replaced.

Other and further objects of the invention will become more apparent upon studying the detailed description hereinafter following and the drawings annexed hereto.

Decription of the Drawings

Drawings of two embodiments of the invention are annexed hereto so that the invention may be better and more fully understood, in which: FIGURE 1, is a perspective view showing the relation of the folding and cutting cylinders of the folder assembly;

FIGURE 2, is a diagramatic view showing portions reduced on the folding cylinder in area of the retaining pin assembly and band assembly;

FIGURE 3, is a cross-sectional view showing the reduced areas under the band adjusting assembly;

FIGURE 4, is a diagramatic view of the gear train; FIGURE 5, is a diagramatic view showing pilot assembly and drilling fixture being attached to the side frame for drilling purposes;

FIGURE 6, is a diagramatic view showing the cylinders; FIGURE 7 , is an elevational view showing a relative location of the auxiliary side frame and drive assemblies; and

FIGURE 8, is a cross-sectional view taken along line 8-8 of Figure 7. Numeral references are used to designate like parts throughout the various figures of the drawings.

Description of Preferred Eifibodiment

The folder-cutting assembly has an upper assembly 1 (Figures 4 and 6) which folds the paper once. A web W or plurality of webs coming off the press (not shown) move over a first drive cylinder 6 to a triangular shaped guide 7 which guides the web W into the first fold rollers 8. As the web W moves between two first fold rollers 8, the paper is folding once. The web W is routed onto a folding cylinder 10.

The folding cylinder 10 (Figure 1) is rotatably supported between side frame 12 on the drive side of the assembly and side frame 14. A pair of bearing openings 16 and 18 are formed in side frames 12 and 14 to support bearings 17 and the ends of folding cylinder 10. The folding cylinder 10 comprises several elements, one of which being the retaining pin assembly 20 which will be more fully explained hereinafter, the adjustable band assembly 22 and a pair of tuckirfg blades 24 and 26. The tucking blades 24 and 26 are driven by a spider type planetary gear assembly 28 within the central portion of the folding cylinder 10.

Synchronously driven with the folding cylinder 10 is a cutting cylinder 30 having a pair of cutters 32. Cutters 32 may comprise serrated blades which engage the paper and a rubber cutting bar 34 adjacent to the pin assemblies 20. There are three pin assemblies 20in the folding cylinder 10 and two knife assemblies 32 in the cutting cylinder 30, thus a 3-2 relationship.

The cutter cylinder 30 is positioned on a pair of shafts 36 and 38 which are supported by bearings 40 and a single bearing sleeve 42 in opening 41 in side frame 14 and the opening 43 in side frame 12. Located below the lower most position of tucking blades 24 and 26 are a pair of second fold rollers 70 and 72 such that the tucking blade 24 or 26 extends just between the nip or tucking blade 24 or 26 extends just between the nip or adjacent the nip between the two second fold rollers 70 and 72 such that the web W is cut and simultaneously forced between the second fold rollers 70 and 72. The finished product is driven from between the second fold rollers 70 and 72 and guided onto a conveyor belt (not shown).

A first method of shortening the cutoff length begins by first removing the folding cylinder 10 and cutting roller 30 from the side frames 12 and 14. The cutting cylinder 30 must be reduced in diameter approximately 1/2 inch and must be moved approximately 5/8 of an inch inwardly toward the folding cylinder 10 to reduce the distance by approximately 5/8 of an inch between the axes of rotation of the respective cylinders 10 and 30. The pockets 37 holding the cutters 32 must be cut deeper to compensate the reduced diameter of cylinder 30. One method of reducing the center distance between the two cylinders 10 and 30 is to enlarge the sleeve bearing hole 43 in side frame 12. This is preferably done by taking a fixture F having a pilot P as illustrated in Figure 5. The fixture F would have a pilot P which may be inserted in opening in side frame 12. A busing B acts to help guide a cutter C to enlarge opening 43. Fixture F may be bolted to existing bolt hole in side frame 12. Therefore, the folding cylinder opening 16 forms a location point to aid in enlarging and moving hole 43. In addition, eccentric sleeves having an off-centered center hole is placed in the bored out opening 43 and sleeve 42 in opening 41 is replaced by a sleeve having an off-centered hole to move the cutting cylinder 30 closer to the folding cylinder 10. A smaller bearing 40 is used in sleeve 42 in frame 14 to allow for the off-centered hole. In addition, drive gears driving both the folding cylinder 10 and the cutting cylinder would have to be replaced by smaller diameter gears to maintain correct surface speed ratios of the web W.

The folding cylinder 10 must be reduced in diameter approximately 11/16 of an inch in the area contacting the web W to reduce the circumference. By reduction of certain areas, the inner workings of the folding cylinder 10 such as the tucking blades spider drive assembly 28, the operating mechanism for the retaining pin assembly 20 and the operating mechanism for the adjustable band assembly 22 will remain useable without altering their structure thus weakening them. Referring to Figure 2, a partial section of roller 10 is illustrated from side elevations showing the retaining pin assembly 20 having a cap 20a which is removed along with pin shaft 20b.

Suitable linkage is provided between pin shaft 20b and pins 57 to move pins 57 out through the paper web W to retain same on the circumferential surface of cylinder 10. The inner walls 51, 52 and 53 of the main casting of cylinder 10 must be milled inwardly parallel to wall 51 and centerline A of the pins 57 and retaining pin counterbores 54 along the length of roller 10 between points B and C.

Thus, hew surfaces 52a and 53a are formed to receive cap 20a without altering same. The lower bearing support 55 for shaft 20b is formed by reboring.

This would permit use of the original pin shaft 20b and pin assemblies 20. The counterbores 54 must be deeepened in order to receive the lowered pins 57 and sleeve bushings 57a. The pin shaft drive assembly (not shown) must be modified only to the extent of changing the size of the drive gear on the pin cam which operates the shaft 20b thus saving the all of the pin retaining assembly 20. The adjustable bands 22 are spaced apart at periodic intervals such taht the tucking blade 24 or 26 actually moves between the spaces in the band 22 to tuck the paper inwardly toward the second fold rollers 70 and 72. The bands 22 are adjustable so as to compensate for different thicknesses and numbers of webs. This is accomplished by a slide bar 56 which has angular formed elongated slots 58 to guide pins 60 circumferentially to cause the bands 22 to buckle upwardly to increase the diameter or downwardly to decrease the diameter. In order to maintain this assembly and it's operating mechanism, surfaces 62 and 64 must be milled down approximately 5/16 of an inch.

A lug 68 must be formed on the end of slide bar 56 such that it will engage the original adjusting screw 66 of the adjusting band control assembly. In Figure 3, the old height of the support surfaces is shown on the right as viewed. Surfaces 75, Figure 2, supports the fixed end 22a and is likewise reduced. The second fold rollers 70 and 72 are reduced in diameter approximately 1/8 of an inch and the center distance between the fold rollers 70 and 72 be reduced by moving them inwardly. Thus, the tucking assemblies are retained undisturbed saving the heart of the folding unit.

The outside diameter of the folding cylinder 10 is thus reduced by reducing the support surface under the working parts without disturbing the working parts or reducing the strength of the parts. As illustrated in Figure 4, the drive train generally consist of a power drive shaft 74 connected to the press. The upper folding unit is driven by a pair of bevel gears 76 and 77 through a shaft 78 to two gears 80 and 82. Gears 80 and 82 must be changed to a different ratio to maintain a surface speed of the paper web W moving through the upper folding unit. Further, bevel gears 84 and 86 must be changed to maintain the surface speed of first fold rollers 8 which are connected by suitable means. Shaft 88 connects the bevel gears 90 and 92 to gears 94 and

96 which must be changed to maintain a surface speed of roller 6 over which the web W moves.

The lower folding unit is driven by bevel gears 98 and 100, Bevel gear 100 is secured to a gear 102 on shaft 101 which drives gear 106 on folding cylinder 10.

A modified form of reducing the center distance between the axes of rotation of folding cylinder 10 and cutting cylinder 30 begins by moving the cylinders from the side frames 12 and 14.

Bevel gear 100 rotates on shaft 101 v/hich is supported in an opening 108 existing in side frame 12. Shaft 101 is replaced and extends through the opening 108. An auxiliary side frame 110 having a lov/er opening 112 is mounted on a mounting sleeve 114 which is secured over opening 108 and side frame 12. An upper opening 116 is formed in a location to support shaft 36 of cutter cylinder 30. Shaft 36 is shortened and mounted in a suitable bearing for rotational movement. A mounting cap 117 allows mounting of shaft 36 in opening 116. An eccentric sleeve is placed in bearing opening 4l in side frame 14 and a smaller bearing 42 is used to move the other end of cylinder 30 closer as required. A mounting sleeve 118 is secured over cutting cylinder bearing opening 43 and supports the upper end of auxiliary side frame 110.

New shaft 101' has a drive gear 120 secured thereto which drives intermediate gears 122 and 124 mounted on stub shafts 126 and 128, respectively. A driven gear 130 is mounted on the end of shaft 36 on cutting cylinder 30 for rotating shaft 36.

An oil cover 132 may be secured over auxiliary side frame 110 with seals to prevent oil leakage into the press area.

A stub shaft 134 is mounted in opening 43 to support a new hub 136 to support gear 104 to drive the folding drive gear 106.

Therefore, the auxiliary side frame 110 permits movement of cutting cylinder 30 without the necessity of boring the side frame 12 or changing the gear train driving roller

From the foregoing, it should be readily apparent that other embodiments of the invention may be devised without departing from the basic concept hereof.

Claims

1. A method of reducing the cutoff length of paper folding and cutting unit having a folder cylinder and cutting cylinder rotatably disposed between two side frames, comprising the steps of: reducing the diameter of the folding cylinder by removing material from the support surfaces under the working parts on the outer circumference of the folding cylinder along the width of the cylinder supporting the web; reducing the diameter of the cutting cylinder by removing material therefrom; and moving the cutting cylinder closer to the folding cylinder.

2. A method of reducing the cutting length of a web paper cutting and folding unit having side frames, a folding cylinder having pin assemblies and bands, a synchronously timed tucking blade within the folding cylinder, a cutting roller having blades mounted thereon, and a pair of folding rollers, comprising the steps of: reducing the distance between the center of rotation of the folding cylinder and the cutting roller; reducing the diameter of the cutting roller by removing material therefrom; increasing the depth of pockets in which the blades are mounted on the cutting roller to permit movement of the blades inwardly; removing the retaining pin assemblies from the folding cylinder, removing material from the surfaces of the folding cylinder supporting the retaining pin assemblies a predetermined distance parallel to the retaining pins in the assembly; machining the retaining pin counterbores deeper; reforming the bearing surfaces for the pin assemblies; replacing the pin assemblies on the cutting cylinder; and machining the surface under both ends of the adjustable bands on the folding cylinder down a predetermined distance.

3. The method called for in Claim 2 including the steps of: removing the cutter roller from the side frames of the assembly; cutting off the drive end of the shaft of said cutting roller; positioning an auxiliary side frame inside one of the side frames to support the new shortened end shaft of the cutting roller; positioning an eccentric sleeve in the other side frame cutting roller bearing hole such that the cutting roller is moved closer to the folding cylinder; reducing the diameter of the cutting roller; positioning a driven gear on the cutting roller adjacent to the end of the shaft and auxiliary side frame; extending the main drive shaft through the side frame to drive the cutter roller from the inside; and connecting the drive shaft and driven gear on the cutting roller.

4. A method of converting a paper folder assembly to cut shorter lengths of paper, said folder having side frames defining cutting roller bearing bales, a folding cylinder, a synchronously timed tucking blade within the tucking roller, a cutting roller and a pair of second folding rollers, the method comprising the steps of: removing all the rollers and bearing sleeves from said side frames; enlarging the hole directly supporting the cutting roller on the drive side of the assembly; inserting bearing sleeves In the cutting roller bearing holes having eccentric bearing holes, reducing the diameter of the cutting roller; increasing the depth of the knife slots on the cutting roller to permit movement of the blades inwardly; removing material from the surfaces of the folding cylinder under the retaining pin as semblies a predetermined distance parallel to the retaining pins in the assembly; machining the retaining pin counterbores deeper; reforming bearing surfaces for a pin shaft of the pin assemblies; removing material from the surface below both ends of the retaining assembly down a predetermined distance; and reducing the diameter of the second folding rollers.

5. A folder-cutter having: main side frames; a folding cylinder rotatably disposed between said side frames; two folding blades; means synchronously moving said blades within said folding cylinder; a cutting cylinder rotatably disposed in one of said main side frames; an auxiliary side frame disposed within the other side frame to receive the other end of said cutting roller; a drive shaft extending through said main side frame and said auxiliary side frame; a drive gear mounted on said drive shaft; a first driven gear mounted on the end of said cutting cylinder between the cutting cylinder and auxiliary side frame; and means connecting said drive gear and said first driven gear to drive the cutting cylinder.

6. The combination called for in Claim 5 , wherein said auxiliary side frame includes: an upper mounting sleeve positioned in a previous bearing hole, which previously received said cutting cylinder formed in said main frame; a lower mounting sleeve positioned in an opening formed in the main side frame through which the drive shaft extends; and means securing said auxiliary side frame to said upper and lower mounting sleeves.

7. The combination called for in Claim 5 wherein: said means to connect said drive gear and said first driven gear is a pair of intermediary gears; and stub shafts extending out of said auxiliary side frame for rotatably supporting said intermediary gears.